.top-banner {display:flex;margin-bottom:60px;}

.about-main {display:flex;}
.about-left {width:255px;margin-right:50px;flex:none;}
.about-left-top {
    display:flex;justify-content:center;align-items:center;
    height:60px;font-size:18px;
    background:linear-gradient(to right,#ff5a00, #e62b00 );color:#fff;
    
}
.about-left-menu {list-style:none;margin:0;padding:0;}
.about-left-menu li {margin:0;padding:0;}
.about-left-menu a {
    display:flex;height:62px;justify-content:center;align-items:center;
    border-bottom:1px solid #dcdcdc;text-decoration:none;color:#242424;
    font-size:16px;
}
.about-left-menu a:hover {color:#e62b00;background-color:#f9f8f8;}
.about-left-menu a.selected {color:#e62b00;background-color:#f9f8f8;}
.about-right {flex:auto;min-height:600px;}
.about-right-top {border-bottom:1px solid #e2e0e0;}
.about-right-top nav {
    height:60px;display:inline-flex;border-bottom:2px solid #d00000;
    position:relative;top:2px;
    align-items:center;justify-content:center;
    font-size:16px;
}
.about-right-top nav a {text-decoration:none;color:#242424;}
.about-right-top nav a.main {color:#858585;}
.about-right-top nav a:hover {color:#e62b00;}
.about-right-top nav .sep {font-size:20px; margin:0 0;color:#858585;width:1em;text-align:center;}